problem booting burnt game

I have a wii v3.4U. I installed the TP hack and the HomeBrew channels works fine. I loaded backup loader 0.3 and that seems to work fine. I installed wad manager 1.3 then wad manager ISO16, ran the CIOS fix and the other wad file that went with that. All that looks like it loaded ok. I installed a game wad file to see if that works and that game runs fine. But when I try to play a game that I downloaded and put on disc i keep getting a read disc error 324. I am using ImgBurn to make the dvd. The dvd is a dvd-r Verbatim write speed was 3x. the game file I checked and it was the right size 4,699,979,776 bytes. The game file was a NTSC file. When I use the boot loader to boot an original game it starts the game without a problem. I have tried to reinstall the wad files for the CIOS fix to see if I did something wrong there but nothing. I have looked on the net but can not find anything that seems to point me the right way. If anyone knows what I am doing wrong please help. Thank you in advance for your help.